Abstract
ABSTRACT CANOPY air temperatures and other meterological data were collected within a 28 ha commercial orchard with undertree sprinkling for frost protection, and in an adjacent untreated control area. Correlation was used to predict temperature increases in the sprinkled orchard when sprinkling occurred. Estimated temperatures without sprinkling and the measured temperatures were significantly different during sprinkling events. Under the field conditions encountered, the maximum estimated increase in air temperature was about 1.7C. Undertree sprinkling heated the orchard only during thermal inversions. A simplified, theoretical model based on easily measured variables (sprinkle application rate, temperature of water applied, air temperature and wind speed) was tested by comparing the data from the field study with the predictions made by the model. Nomographs were developed using these variables to predict orchard heating from undertree sprinkling.
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